Shaft seal

US4128248A · kind A · utility

Assignee

• Leybold-Heraeus GmbH & Co. KG · DE

Inventors

• Hans-Peter Kabelitz · Cologne, DE
• Nikolas Sideris · Cologne, DE

Key dates

• Filing date: Jun 6, 1977
• Grant date: Dec 5, 1978
• Expiry date: Jun 6, 1997

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S277/927
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A dynamic packing for sealing a shaft which passes through a wall separating an oil-containing space from an oil-free space or from the outside atmosphere, composed of two shaft sealing rings which engage the shaft and define an oil-filled gap therebetween, and a duct composed of one portion in communication with the oil-containing space and another portion in communication with the gap to place the gap between the sealing rings in communication with the oil-containing space and which is provided with a closure element in the form of a diaphragm having one of its faces in communication with both duct portions, the duct and element being provided to relieve the pressure in the gap.